Electric switch.



WITNESSES:

' Jaw APPLICATION FILED AUG. 11, 1911.

J. RMcELROY. ELECTRIC SWITCH.

Patented Apr. 21, 1914.

IN VEN TOR UNITED STATES PATENTOFFIGE.

JAMES F. HOELROY, OF ALBANY, NEW YORK, ASSIGNOR T0 CONSOLIDATED CAR- HEATING COMPANY, A CORPORATION OF WEST VIRGINIA.

ELECTRIC SWITCH.

Specification of Letters Patent Application filed August 11, 1911.

Patented Apr. 21, 1914. Serial No.'643,575.

To all whom it may concern:

Be it known that I, JAMns F. MCELROY, a citizen of the United States, residin at lbany, county of Albany, State of ew York, have invented certain new and useful Improvements in Electric Switches, the following being a full, clear, and exact disclosure of the one form of 'm invention which I at present deem prefera le.

For a detailed description of the present form of my invention, reference may be had to the following specification and to the accompanying drawing, which illustrates my invention.

Figure 1 is a plan View of my switch with the casing shown in section; Fig. 2 is a frontelevation thereof with the cover of the case removed; Fig. 3 is a side elevation thereof with the casing shown in section.

My switch is of the double-throw type but designed to make momentary contact in one direction or the other and then be restored to its neutral or central position b means of a spring. In particular, I provi e a centerlng spring connected at one end to a movable anchorage operated by the switch lever, and at the other end to the switch lever. The operation of the movable anchorage by the switch arm or lever is produced by means of projections or wings on each side of the switch arm which normally rest against the said movable anchorage and, when the switch arm is turned to either side, act to force bark the said anchorae and thereby increase the tension exerted by' the spring whenever the arm is moved from its normal central position. The result is that the full tension of the spring tends to throw the handle to said central position. The moment it passes that central position the said projecting wings on the switch arm, one or the other of them, engage the anchorage and force it back so that the full tension of the spring resists motion of the switch arm away rom its neutral position. At the same time the full tension of" the spring is maintained up to the neutral position of the arm and then resists fhrther motion thereof.

Returning to the drawings, G represents the box or casing of the switch on the base of which is placed the ordinar insulating plate B. At the upper end 0 plate B is mounted the block or standard A to which is ivoted one end of the T-shaped switch arm g by means of a steel pin H. To the aforesaid block or standard A is also pivoted the U-sha ed spring-anchorage D, a pin C being passe through the extremities of the two arms of the U and also through the block or standard A, as clearl appears in Fig. 1.

E is the switch arm having a handle E external to the casing and provided with lateral projections or wings E E" which give the arm E its T form. The wings E E bear normally upon lugs d on the respective arms of the U-shaped anchorage D. A spring S is attached to one end of the cross bar of the anchorage piece D and at the other end to a lug on the upper side of the switch arm E adjacent to the handle E On the rear side of the switch arm is a contact F adapted to bear upon one or the other of the stationary contacts F F according as the arm is turned to the left or right.

The switch arm E is shown in the drawing in its central or neutral position, in which position it is maintained by the tension of the spring S. If, however, the switch arm is turned either to the left or to the right, one of the projecting wings thereon, E or E will press against the anchorage piece D, exerting a sort of cam action thereon which causes the said anchorage piece to turn upon its pivot in a backward directirn. This will act to elongate and thereby increase the tension of the spring S. Conversely the tension of the spring will force the anchorage piece against the projecting Wing and thereby cause the switch arm\ to rotate about its pivot toward its neutral or central position as soon as it is released. It cannot pass beyond the central position, however, because of the pressure of the anchorage piece against the Wing on the opposite side. he arrangement requires but two parts and thesingle spring, while the U-form of the anchorage allows it to bear on both or either one of the wings E E and to thereby cause the switch arm to rotate about its pivot toward its central position. Moreover, the full tension of the spring is exerted clear up to the neutral point andresists movement beyond that point.

What I claim as new and desire to secure bw Letters Patent is: 1. The combination with a switch arm, of a pivotally mounted spring anchorage, a spring connectin the arm and anchorage, and'oppositely disposed laterally projecting wings carried by the arm for engaging and moving the anchorage.

2. lhe combination with a 'pivotally mounted switch arm, of a spring anchorage movable in a direction other than the movements of the arm, a spring connection between the arm and anchorage, and laterally projecting wings carried by the arm for able pivoted switch arm provided with oppositely disposed extensions one on each side of the pivotal point, of a pivotallymounted piece bearing upon thesaid ex-. tensions and tending to rotate the arm towardits central position and a spring connection between said arm and said piece.

5. The combination with a pivoted switch arm having lateral extensions one on each side of its ivotal point, of a pivotally mounted U-siiaped piece having its respective branches bearing upon the said exten sions, and an operating spring for the said piece.

arm having extensions one on each side of its pivotal pomt, of a U-shaped springbearing upon the switch arm.

.a contact carried by the spring connecting the anchorage and arm and tending to cause the anchorage to free the Said extension, and a spring between sa1d anchorage and the v weaves arm having extensions one on each side of its pivotal point, of a. spring-anchorage pivoted on an axis at,right angles 1 to the pivot axis of the switch arm and bearing against the said extensions, and a spring between said anchorage and the arm.

. 8. The combination with a pivoted switch arm having extensions one on each side of its pivotal point, of a U-shaped springanchorage, a spring extending from the cross bar of said anchorage to the switch arm, and pivotal bearings for said anchorage at the end of the U-branches.

9. A switch comprising an insulated basc )rovided with a standard, a switch arm havmg one end pivotally connected to the standard. a spring anchorage pivotallv connected to the standard, contacts carried by the base, switch. arm, and a arm to .a neutral position.

10. An electric switch comprising aisup-v port, a switch arm having one end pivotally connected to the support, a spring anchorage pivotally connected to the support on an axis at right angles to the pivot axis of the switch arm and bearing on the pivoted end of the switch arm, and a spring connecting the "anchorage to the switch arm. 6. The combination with a pivoted switch In witness whereof I have hereunto set my hand, before two subscribing'witnesses, this 9th day of Angust,l9l1. anchorage having its respective branches JAMES F. MoELROY.

Witnesses:

HERBERT A. CALKm-s, CLARENCE PALMER. 

